Due to its strange morphology and unusual diet

with an average length of around 1

junto con cambios climáticos y ambientales

The metacarpals and metatarsals were long

Stethacanthus altonensis Variant:Primed Due to its strange morphologyStethacanthus altonensis is an extinct cartilaginous fish from the Early Carboniferous (late Mississippian, approx. 330320 million years ago), belonging to the Symmoriida group within Chondrichthyes, a primitive lineage closely related to early sharks and chimaeras. It is the type species of the genus Stethacanthus, a taxon particularly renowned for one of the strangest anatomical structures known among Paleozoic vertebrates: a modified anterior